“The guardian angel who conquered your enemy in battle was perceived by your enemy as a demon destroyer”

“Angels and demons were identical--interchangeable archetypes--all a matter of polarity. The guardian angel who conquered your enemy in battle was perceived by your enemy as a demon destroyer.”

“To fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy's resistance without fighting.”

“Hence to fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy's resistance without fighting.”

“The greatest enemy is conquered only in death. Your greatest enemy is yourself.”

“An enemy, Ender Wiggin," whispered the old man. "I am your enemy, the first one you've ever had who was smarter than you. There is no teacher but the enemy. No one but the enemy will tell you what the enemy is going to do. No one but the enemy will ever teach you how to destroy and conquer. Only the enemy shows you where you are weak. Only the enemy tells you where he is strong. And the rules of the game are what you can do to him and what you can stop him from doing to you. I am your enemy from now on. From now on I am your teacher.”